Okay, perhaps there are people like me (I just found this out myself)... Googlebot doesn't cache session information - so if your website works with sessions, you may have to do something about it...

Check out the many pages for the phrase (googlebot session) and notice the similarities in the results.

do not follow the links to the pages titled CLIENT REFUSED SESSION. Instead look at the cached copies off the results page to see what Googlebot saw.

Googlebot doesn't do JavaScript either...